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Amico 0.5 Ton Zinc Coated Logging Rolling Single Rope Pulley w Swivel Hook by Amico. $4.36. A pulley, also called a sheave, is a mechanism composed of a wheel on an axle or shaft that may have a groove between two flanges around its circumference. A rope, cable, belt, or chain usually runs over the wheel and inside the groove, if present. Pulleys are used to change the direction of an applied force, transmit rotational motion, or realize a mechanical advantage in eithe...